X-Fade has a point. If the resetting is too onerous, we could look at some kind of inheritance based on version numbers; but let's suck it and see?

In terms of removing packages from the extras-testing repository, I think so. I imagine a use-case might be something like:

1. User enables extras-testing
2. User browses through App Manager for interesting things to test
3. User installs one and then finds its QA page to vote on their experience

If they find a package, but no page, they may assume the package has come from Extras.